<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>超全局数组</title>
</head>
<body>
    <form action="login.php" method="get">
       用户名: <input type="text" name="username" placeholder="账号"><br/>
        密码: <input type="password" name="password" placeholder="密码"><br/>
        <input type="submit" value="登录">
    </form>
</body>
</html>